Re: zone plate image quality

I have not done any experiments, but I am very interested in this topic. Ideally,
a physics person should be contacted for numerical answers (perhaps someone on
this list is a professor at a university and knows someone in the physics
department?).

Unfortunately, one of the qualities of zone plates and pinholes is that they
always have a single optimum wavelength of light, depending upon their
configuration. Focus would not be perfect with that wavelength, but focus
decreases with wavelengths farther from the optimal.

It would be interesting to see the difference in focus between a pinhole or zone
plate used with full spectrum light versus using a filter to create monochromatic
light of the optimum wavelength. The difference would likely be noticeable,
perhaps remarkable (or perhaps not : ) ).

Jarred

"Richard M. Koolish" wrote:

> I can think of a few things that might affect zone plate image quality,
> the number of zones, the density of the dark and light zones, the thickness
> or characteristics of the zone plate film. Has anybody done some experiments?
>
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Received on Wed Nov 29 14:39:32 2000